Computer Science
Scientific paper
Jan 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993gecoa..57..219l&link_type=abstract
Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 57, no. 1, p. 219-230.
Computer Science
2
Geochemistry, Igneous Rocks, Neodymium Isotopes, Rubidium Isotopes, Samarium Isotopes, Strontium Isotopes, Abundance, Diffusion Coefficient, Melting, Metamorphism (Geology), Petrography, Scotland
Scientific paper
The effect of magma-xenolith interaction on the Rb-Sr and Sm-Nd isotopic systematics was investigated by studying the Rb-Sr and Sm-Nd variations in dissected crustal xenoliths sampled from different localities across Scotland. The Nd isotopic compositions were found to be virtually uniform across each xenolith, but significant variations were found in Rb, Sr, and REE concentrations, as well as in Rb/Sr and Sm/Nd ratios and Sr isotopic composition. Most of these variations appear to be inherited from the protolith, but, in one case, they have been modified by melt infiltration from the host magma. The results lend confidence to the interpretation of the isotopic and chemical compositions of xenoliths transported in basaltic magmas as reflecting their source regions, but they also highlight the potential problems of interpreting Sm-Nd model ages from metamorphic rocks.
Halliday Alex N.
Holden Peter
Hunter Robert H.
Lee Der-Chuen
Upton Brian G. J.
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